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Importance of Loop Effects in Probing Lepton Number Violation
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abstract
The discovery of the lepton number violation would be a smoking gun signal for physics beyond the Standard Model, and its most sensitive probe is the search for neutrinoless double beta decay ($0\nu\beta\beta$). Working in the framework of the Standard Model Effective Field Theory (SMEFT), we show that one-loop effects can remarkably improve the tree-level bounds on the new-physics scales for several dimension-7 operators. Using ultraviolet model examples, we then showcase the competition among $0\nu\beta\beta$ contributions induced by dimension-7 and loop-level dimension-5 SMEFT operators.
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Cited by 1 Pith paper
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Neutrinoless Double-Beta Decays from Operator Mixing
Renormalization-group mixing lets heavy-quark dimension-seven operators feed neutrinoless double-beta decay, giving some of the strongest current bounds on these new-physics operators.
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